Allows a Rockwool user to seamlessly stack a 4 inch cube on top of a 6 inch cube or a 6 inch cube on top of a 8 inch cube, blocking light and eliminating algae, all while allowing in the necessary air a plant needs to thrive. Doesn't include the grow media!

This item is sold individually. The case size is listed for your convenience for instances where you wish to order in case quantities.